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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45fb3a9e443404e01fa0eaad75b563040958acd87e813bc75daad9449149a942' 
  AND token = 'h4P84zEPEoz4FNFMYMJN8HTN+u3zGhGxj33cD/RFb1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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