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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2be0ee00036ee444b8c2a96660e6096d5594c81521a6796ff6be3aaed11e87d' 
  AND token = 'h5tOPu0Mo1TCLW66OYFpjcgJqxULbYygSB1/Hvi7d/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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