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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d8a6f27a28beebe3c1bdc2d1910d1a532fa7ad678886232aa05e5838657a2e' 
  AND token = 'ncAKlGDYMk7Te6nyUmzQNAFAnmU7vparrcjY+oSuWYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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