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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a83ea42623621a4cb43885160ab4b22d5411cae6048097ded9d804bcd9850d9' 
  AND token = 'ehlkBQLZxRm4AQKIC/EkwaNuRBy0+UgO3EyGR2NIHXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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