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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '269a14340321f5d0077108a9874df0ff5e0f6c9eaab02021440f0e53dff1966d' 
  AND token = '2ZBwaTC7Hot+5o7lpqXy80plH7Vwqu50kSKFbGb2Nw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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