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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd80449e8fdb0ba7ea527cab84aa4d92ca8fc783fa209ee407195af2549616ad9' 
  AND token = '8YliuIx7PJWdgdEcLKQCRQ73He/KKt5v6+pNJxetQ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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