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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6193dd708ee72122c299e8f9a8f1e9015ca813fe662915e8c56c4fa6c390136' 
  AND token = 'tbOMMujtq7W0YS9L2ZmaZC3NHB8tpsmcIVGh4CS3k2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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