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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a93c1371aef9069617ed8ff6e24742821637a44696721ed0bb11ccba129e16d' 
  AND token = 'gL8S5DVzt+RjkuY4O+uRs3wKOrdeD69d0BDwyM7MpVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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