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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e29cc3437b87b1b9d94bd1006ac52285ee50ec75bc81981b51428fc562ed4d10' 
  AND token = 'u1v6spKS2LuzRDsQKaztlTXZyAsmfcSk63g2Gz1EXYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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