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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dd158ffcbdc65b6d17bfb79aefdb306b9d5a253a44307acc87be2841c97d9e6' 
  AND token = 'k7cXh38Hq78BUMVcWTQ13PCagr7zSUSsLtmoaW//nhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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