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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fecf9691fa7aca4c9ee3d77ad036fa2168f47fcf08ec1aa0dca34df4bb88d75' 
  AND token = 'O+ypOES9aZyanH1aEZ4W6bxgZTbxt3nHXgk+y9LgG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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