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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca7cab93ffbd2beb066720023715d9fdf67ae42d42d427b14ec170e14dc19f4c' 
  AND token = 'mWRL+kI0Le2Ib2o4CpBZSx3ScXZaCabyqAlN7AamVWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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