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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce1df08299a58430df793097fdbbed4a24c96b3301230e0d425f349b3c553e9f' 
  AND token = 'XHDDV/u/cWfo9HQV2S0D1kFg1ZfWnllQ8XMFkmM+m8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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