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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2027caa6d0476767bf300d155d62df67ff1dc2aaec57a8eaef20ddf75a73e8a' 
  AND token = 'pMTqfMXi9lSehJ0BUWdRKFBHi8v46VO3XfcDybrblpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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