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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0d3f8c65982aff35074976cfb29cc358ead32f01b4eadd325eaf5e373355094' 
  AND token = 'AW7jsmJ8pgKT0rhso16pVEZm0PYiILosremNd03t+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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