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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '388b5856f8b88de512f3fe3db171409e518450c53f724b8ff0b48b70f8efd250' 
  AND token = 'xeWNYAu/dr9NukyJzjZmg2yAz8FNGZ8UQmptJRH4uOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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