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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6ea07966a292b35d53768534e765569cc509e3bb8f9086ed83f58918e3f7c15' 
  AND token = 'RR9ECVBV5nYCkwtwepWdIjchGOrWWJCYpXsVRBg8skg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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