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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37f4978eb6870836785e37bc0982706b1e7a43ff99eab8db7ea2e3a520a61efd' 
  AND token = 'o7G+VdjF9O+q97ZIW0bH7b2MIq95raIMlRabqBMmr/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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