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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daa1915d5b55abdfc8a8a9f2ac03ca3497339223ee44278aff68e0a803ccf4ec' 
  AND token = 'HVU7PpvoCaG305dBJ40OEONl7W/1jvEUqyEHXnSD2s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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