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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00171bf629fdcd27397f6d3a411ececeae8a71298eb69bfe787ae00a9c0b5987' 
  AND token = '7VX57f6n7BCi/TMEPymk4glaZ4HSAaKjw7dj8u/+cXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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