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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0082a075c3615e1f9ba8f22c1183178b89638436c6ab881c223f4704676eaae6' 
  AND token = '8WPefk6hrhOMC1Yv1VneOdCLV7L9PgwiWA3dm1HJl0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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