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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b13ddf87fd19095e8f5b730892b104b2d97177fc1ef5c28fc3148aa917efd147' 
  AND token = 'ilct1ch65dnrBpCtF43XmuFwGhxH3zcuEwVeojzja9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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