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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43d005d986bc1f98a70c2507aef5df0298e747770b0cc9ca17fafbe4397c6671' 
  AND token = '+ubUXzlNffZ8jBTpz6IvfcGS6sBlq97Hs8TzGi74dTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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