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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceedeecbc6d5b34925f4b2eb6b223b26a21041e08deae528c795b647a89be25c' 
  AND token = '2kMGgdfezbEafB/RSR1wDJ/J/s6+gBtM9BiOIochjq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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