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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2ade28576e882bbac4da4dc764ed572e2479899c003c599644f5a0c037b2941' 
  AND token = '/n8fURULkYIoWiCmi7kmanOk4uVNATTghBs0/Zok7p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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