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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf9284924d6a150fd611ebfac42f4288328ae3fd9782698d8db2e2cb708c242d' 
  AND token = 'Bt8Jc8yUAcV4RssCulEg6kTloUc/28EAAS/vRND0AME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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