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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '328457d237e33aea1c965a51452de57c6a46251643c576a696926697bc2c9cae' 
  AND token = 'gUw4UMhNM6ML3LM249Ea4HbZp7vVUF4bMyfpmtb4JpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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