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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99fbde41b2faf33bb01133b944f4167d6defe3453371b790c279c19e9bd9627f' 
  AND token = 'CRY0zw36yULxTcCfkR+GJA+1Xf8nSl3APVQc40KVqTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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