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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2a9de69f161dac54c245e7817d1d1c27eae01d3aefff734767636046f0957a' 
  AND token = 'eRSSHHeFnGn3ZFJlrWA5T8kt7ploj4tlxY9UDQGkUGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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