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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00de3fa5389bce13b42564f956f249a465913c10a7b153f739fb10dc3ce874e6' 
  AND token = 'g1w54IadZXWK7Gd55x9RUEfy+5fyHvxwBF1t+ZfBGpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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