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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d8eec8c5df5fdf658af9c553e7bc85811c2e9b31ce425f7694331734e9bf9da' 
  AND token = '7wRfzPUMYmB6tw3TpTDztcP6y3yL+59tZw85BG4mrAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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