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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c31ca48d81778c387a139bdb8453e4adb3eea6ea083ab010ae544c6d7b1f9f1e' 
  AND token = 'RbDGP08b0UOCtbGNlumqAu/v2G6MoJWZE4OgZp/wc6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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