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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5685f8c194f5b3574899fe72d4954606f37d9f15c39932bdb9cc914d68b0983a' 
  AND token = 'dw6jwbSKY46Uc7DDT//k5sX0QR+TH7yoQ9EDjEYFYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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