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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ee4fb5b535fe0f01357db001d16e8117a3e3aeb271185c1684979dc094481ad' 
  AND token = 'RON74Odq+BX5u5fSvLQEBoE7SRpyfkO/cQ8myCbSJTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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