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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '431a063cfd57c8faabfa7703e8b38955567623abd0188c81c07594510d9f32c8' 
  AND token = '2Dxz1YLYh75GRl4n/ir823xpyaEiIgLWSdqMipr7yoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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