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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e3c86915b5ccc899c819787691b4b977ac9eac20b7c23644b26d1409c562eb9' 
  AND token = '7uZVI57a2NJdgfnm9M2YOmV/5Z5Qg0rv731BbY7+z0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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