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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b84c69831e5874d35a4b97b3475e17e865c8799366e628362c04b06b51c0de1' 
  AND token = 'XjKRps+bAD+asiwDJzTMDWm87Aw4CH99x/obv3phwhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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