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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0960a24b2621d42923cb25a926175cdda3fda835870939e0a846618442c3bc9c' 
  AND token = 'NPN5hHPF9p3JJVmUNdXCU5UT92bCVeSffTLciJZ2KGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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