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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb273c9091afcc1e0bc80955d387d064d1520904c7910862dd3df45e61ad01a6' 
  AND token = 'BynTuqJslkkjupP0HepZwWATZ9cEzH88PvwHO6f4tIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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