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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4607f84d4464bbb976856bbc17ceb82174fe65a05860b29b8910e1fe8059f816' 
  AND token = 'jUWHGt0GEuzUlD55jX05JYWZAWHfU2/WeTgqJR5w9jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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