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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fcf6604dd86c202c20f6c6b55d86c8d62b4a9fd48ccbacf952f277952621263' 
  AND token = 'EUCVYbR9281CsUBZ54mc/0BYL/S73W+EkdNed7zHpWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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