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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc568038372b3095a26ab843ee2744e7ef8578eaf4318fa8059d7b3fb5311eb4' 
  AND token = 'uQEddw75SvFshh0lyinYf0y41fg2UWZw29HN7Q+9HFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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