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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823a9a51d5429afe34cc9212349de729c88a92bca79566c2d33333131ec6685c' 
  AND token = 'cfOS8MhNxG/b4ZOk8c3qZZ1akY/0PDpoODtxX1Vnch0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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