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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db2fbfee17239b142d1a346f02b27cfb836b2deed76687919bb64b2a4e2869aa' 
  AND token = 'SXm529Esj9WyPgUeImJBwOTRWgKfxeV91QpDJpHXGbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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