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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766cf4d74a5cb55284ea681d05a785cc73af096aa2f29965c8484e1252b88bad' 
  AND token = 'EZ1Gnuf4MV2XsH89MYuQoAq5XYum2dPUEcBQt2eZvEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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