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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0db58c181ccde25bfc9f68060664fdc50a0d4affdb6351da7d2ae16fb696a2dd' 
  AND token = '193zcPyv3sEwww+YTchTBN5MT6YFAGg+IOHzofKc504=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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