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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f840f163a6e6f66d2044b42afb71a6de32e1c8f38eb3312c811fcaa3ce73ba4a' 
  AND token = 'yg/mkE6cZGq2eoT2wclj1jkPISS02UJtmtv/83x79I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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