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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44cfa4cc0feaef87408c963ec29c438d36c1381cce66e9cd166ac6334bcadccc' 
  AND token = 'WJ233v2uuBFQHkeCg7Il/Fl/bUG2kaesVQzQaD2RJ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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