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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '875ed13442c33a5e053d0a8731e90e5805c64b1b92533c672d7d90cd6d2639be' 
  AND token = 'L6+Z6+hEuBBzXVTobfhuX+0/w43e2houoKJ5cynchfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}