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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7300e055ef1d691c1383a3adfdbef327512710de0d4837c1d55e0684efed67b4' 
  AND token = 'nNVqjzAgfoFQSE4WTp2Un2Eo9NRu0CRD/sOEC5rAvP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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