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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0c9d5689e36d8b854385a97d4aeee3f16f6a0e9c625f4c6f7beba945f4f3d96' 
  AND token = 'hHCw61eEk5ELvjTN+sq5+udhQ1KJTI3hXxrDrE2SsNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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