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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66683b00508f6cb560aa4b72a073be9dfda0566c90ad0be905d16ef8422bf8bd' 
  AND token = 'VMOvvxanmZaeckFj/bGpauzSieqDE5aT8rsCsJjTyhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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