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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84e24548fed942b88c6dd80a76964f89b033ac6eac238b8b2380e92947023c48' 
  AND token = 'slbhoauVbYEq2BdfpRVuwKj3KcWNjqqg1gK39Oj1EjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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