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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f200fcf8ed5571ca63ff15fa8b0f7a1c09c1695bc1c7acd2de31a609b5cc005' 
  AND token = '76lJZgfVGwbFKUjmF0YEU4FZPaj6cNOmhRWFs0W72Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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