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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '698a3d2bf58b6abc861efcc939342e2649b9d3d5d82719a7cc3baa2b09586be5' 
  AND token = 'CPJTpdiJ/fdSlkmlRErjltWQa1jPbj9h/JJJFpx2g5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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