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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f8c890d8daeed6a672ba29eea4e3f9bb40f1f2c4c3dc6b83b637de6995367a6' 
  AND token = 'EPJZmcAZs2fpEao7fFhHHqgFRyVz9ZoduMI35m3fNVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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