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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c361fb5d47142c6476a7ab927ca21006962e2a0d78d8f11450c2b48c706fc4' 
  AND token = 'q+Y2xoVcgJOP6jRCBqTlgS2UqzeD6mg7IdneUikAJbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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