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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcd46646add1301a03a0a3a6fc72b8a0fd039dde5a6ffc081d850dd336c554a' 
  AND token = '8Vg+4d2wWwmy/CnR58erM/fEMqmIZK2fJJY0ii5k8t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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