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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61147dd164361fb77a177542c3c401987eb1d9d5efdb46ddf4f43992cbc4d0ce' 
  AND token = '7hUkfgL0XF0Ksva4ASC8EMjiFBVgSU8p2G4mtPkj+Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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