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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '051e49e4515ea91a506bded63f4ba0022a4501a3ca626ca7faa3d7e28091e5ff' 
  AND token = 'WbrnG2fYfNVPZI+1Omwmty34X1yytvWoYCX3hLTJgP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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