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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '784e550ccbc4741401b6508f83f89999bdc22aa2aaaa8ead6e52a13dc18a0c11' 
  AND token = 'cbqWcRH6FNlAVhHWMcL5rD453FUpL8XyBefPKHhA5GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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