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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f217a73c0142f7044e1b050354012364ed07a6404548b10cb0fb5e5ffa2eceb' 
  AND token = '0EXZn2fFmOBe7H/YT6Gwlbj4kMjJ0Nh/1e6VmXIUAi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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