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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3086cc733b34a713a2b17db31c05e6f5094cef5b5933fc8210a378c25f87d26e' 
  AND token = 'TWCrycvbhYfm+85nBcTDIUeo3T6HvffG97Ml4aA+4aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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