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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f057439aa072c063d8e038e5410d11be127c1c55027208d18e91acb59bc4f6f1' 
  AND token = 'rhjNBw2O5Ze0MSkDtbJ7swkjyimxs0ATTIsCK+iH+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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