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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d3536d0ec5de97d1d718dffef3b631fbb56ace2b0032643d0789bc9d6df05b1' 
  AND token = '3LkDrPMzNG3QFAM0+9h+5NN88H8UkOJ2LKrsysep7sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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